<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .container{
            background:red;
            width:10px;
            height:10px;
            margin: 10px;
            border-radius: 5px;
            
            
            /*多重投影,投影形状跟附加的元素形状一样 ;扩展设为负值有缩小的效果 */

            /* box-shadow做边框可以不占用容器位置和布局 */

            box-shadow: 200px 200px 0 5px green,
                230px 200px 0 5px green,
                215px 215px 0 -3px red;
        }
    </style>
</head>
<body>
    <div class="container">
    </div>
</body>
</html>
